Leak detecting device for fuel vapor treatment unit
First Claim
1. A leak detecting device for a fuel vapor treatment unit that purges a vapor gas generated through evaporation of fuel in a fuel tank into an intake system of an engine, comprising:
- a valve that can selectively seal the fuel vapor treatment unit;
a pressure detecting sensor that detects a pressure in the fuel vapor treatment unit; and
a controller programmed to;
issue a command to close the valve with a view to sealing the fuel vapor treatment unit during stoppage of the engine;
calculate deviation amounts of the detected pressures during stoppage of the engine after the fuel vapor treatment unit has been sealed;
integrate absolute values of the deviation amounts, and determine, based on an integrated value, whether or not there is a leak occurring in the fuel vapor treatment unit.
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Accused Products
Abstract
Disclosed is a leak detecting device for a fuel vapor treatment unit that purges a vapor gas generated through evaporation of fuel in a fuel tank (2) into an intake system (22) of an engine (21). The leak detecting device includes a valve (5) that can selectively seal the fuel vapor treatment unit; a pressure detecting sensor (8) that detects a pressure in the fuel vapor treatment unit; and a controller (10). The controller (10) is programmed to: issue a command to close the valve (5) with a view to sealing the fuel vapor treatment unit during stoppage of the engine (21); calculate deviation amounts (P-P0) of the detected pressures during stoppage of the engine (21) after the fuel vapor treatment unit has been sealed; integrate absolute values (|P-P0|) of the deviation amounts, and determine, based on an integrated value (s), whether or not there is a leak occurring in the fuel vapor treatment unit.
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Citations
9 Claims
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1. A leak detecting device for a fuel vapor treatment unit that purges a vapor gas generated through evaporation of fuel in a fuel tank into an intake system of an engine, comprising:
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a valve that can selectively seal the fuel vapor treatment unit;
a pressure detecting sensor that detects a pressure in the fuel vapor treatment unit; and
a controller programmed to;
issue a command to close the valve with a view to sealing the fuel vapor treatment unit during stoppage of the engine;
calculate deviation amounts of the detected pressures during stoppage of the engine after the fuel vapor treatment unit has been sealed;
integrate absolute values of the deviation amounts, and determine, based on an integrated value, whether or not there is a leak occurring in the fuel vapor treatment unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification